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arthuryemi: Is this thread still active

Yes, very much active. Only that we lost 5months of valuable data.

For more contact FEMI on 08023662352 and 08165304602

Magodo Phase 3kw Installation

4. DETERMINE THE SIZE OF THE SOLAR PANEL ARRAY.

The size of the array is determined by the adjusted daily energy requirement using the Fudge/losses factor number divided by the sun-hours per day. So for our design, 9000 wh / 5h = 1607 watts, round up to 1800 watts.

5. DETERMINE BATTERY SIZE

Determining battery size is very simple. All batteries will last substantially longer if they are shallow cycled. That means discharged only by about 20% of their capacity in a given day. Whereas deep discharge means that a battery is discharged by as much as 80% of its capacity. Second point is no lead acid battery should ever be discharged more than 50%. Below 50% soft lead sulfate crystals harden on the plates which reduce capacity and shorten battery life substantially. So in real application you have 2 days of usable capacity to allow for cloudy days before reaching the 50% discharge.

To figure the daily load, go back to the original load number before the fudge factor—that is, 6000 watt hours. Battery capacity = Daily Watt Hours x 2. So we need 6000 watt hours x 2days = 12,000 watt hours or 12Kwh.

Now that we have the battery capacity in Watt Hours we need to convert to Amp Hours. To find the Amp Hours we need to select a battery voltage. Amp Hours = Watt Hours / Voltage. To select battery voltage is based on panel wattages vs controller size. MPPT charge controllers have maximum panel wattage input vs the controller’s current rating in AMPS. MPPT controllers typically come in 20, 40, and 80 amps. So selecting battery voltage is very important. As a general rule you want to run the battery voltage as high as economically possible.

I have some general rules of thumb for battery voltage selection:

1. Never use 12 volts. 12 volts is for very small solar installation.
2. Panel wattages 500 watts to 1000 watts use 24 volt battery
3. Panel wattages higher than 1000 up to 4000 use 48 volt



So for our design, we will use 48 volt batteries. So the battery capacity in Amp Hours = 12,000 wh / 48 volts =250 Amp Hours.



6. DETERMINE CHARGE CONTROLLER SIZE IN AMPS

It is very simple, Charge Controller Output Amps = Panel Wattage / Battery Voltage. So for our design the minimum MPPT Charge Controller is; 1800 watts/ 48 volts = 37.5 amps. So it requires a 40 amp MPPT Charge Controller.


7. CONCLUSION & LAST COMMENTS

We need to re-visit batteries for a moment. Flooded Lead Acid (FLA) are the least expensive and last the longest of the lead acid chemistry. However they have one drawback and that is they have the highest internal resistance. What this mean is the maximum charge rate they can be charged with is C/8 where C = the battery 20 hour discharge rate Amp Hour Capacity. So the maximum current we can apply to a FLA 250 AH battery is 250 AH / 8 h = 31.25 amps.

Recommended Design Practice of Off Grid Solar Power Systems

The design process is a fairly simple and straight forward that doesn’t require a lot of technical knowledge. What follows is based on using MPPT Charge Controllers because they are the most efficient and economical solution for systems requiring a 200 watt or higher solar panel. The initial steps are:

• Determine the load in energy for a 24-hour period. Not the watts, but the watt-hours.
• Determine the size of the solar array to be used.
• Determine the battery size and type.
• Determine charge controller size


DESIGN EXAMPLE

The following example is a rough estimate to take to a system designer to discuss cost and objectives. He/she will then fine tune the system based on actual components, cable distance, etc… Our basic objective in this simple example is to provide power to a 250 watt load (light bulb) for 24 hours per day with 90 % availability. Getting from 90 to 99.99% greatly increases the cost with a larger solar array, larger batteries, and a standby generator set.

1. DESIGN FOR WORST CASE

In this example the worst case is simple to determine because the load is continuous 24 x 7 x 365 of a 250 watt light bulb. So the worst case is during the raining season when the Solar Insolation is at its lowest point of the year.

So in this example we need to determine the energy needed in a 24 hour period. This is done with watt-hours. To determine the watt-hours is straight forward of Watts x Time (in hours). So 250 watts x 24 hours = 6000 watt-hours or 6 Kwh in a day or 24 hours. Make note of this number as it will be needed later.

2. CONSIDER THE LOSSES

To account for overall system losses in the wiring, charge controller, battery charge efficiency, and inverter you multiply the total 24 hour load energy by 1.5 So 6000 x 1.5 = 9000 watts or 9 Kwh. Now take note of this figure. Take Note, if using a PWM Controller the Fudge/losses Factor is 2

3. DETERMINE SOLAR INSOLATION IN HOURS

Most solar map data are given in terms of energy per surface area per day. No matter the original unit used, it can be converted into kWh/m2/day. Because of a few convenient factors, this can be read directly as "Sun Hour Day” The number you want to use in this example is during the raining season when the sun hour day is lowest. For this part of the world, I’ll suggest we use 5.

alldruns1: Do u have any inverter btw 1 to 1.5kva wt automatic switch btw nepa and inverter? And hw much

Yes I have 1.2kw (that's 1.5kVa) and its 25k. All my inverters have auto changeover and all the other protective shutdowns to prevent it from developing fault.

Thanks for ur enquiries.

This Installation was done at Abraham Adesanya Estate in Ajah

2pcs. 12V 200ah Deep cycle batteries
30ah External Charger
2000W power inverter with inbuilt charger
Fuse box and changeover switch

Old installation 780W solar with 3kw power inverter

This Installation was done at MAPARA, a village behind MFM headquarters in Lagos.

4pcs. 130W solar panels
1pc. 12V 200ah Deep cycle battery
1200W Power Inverter
25A fuse box
1pc. 12/24V charge controller
Solar Rack
Installation.

All these was done at a cost of N250k

This Solar Installation was done at Nordica Fertility Clinic Yaba.

1. 1040W Solar Panel (8pcs. 130W solar panels)
2. 6pcs. 12V 100aH Deep cycle batteries
3. 12V/24V 50A charge controller
4. 2KVA Power Inverter (Local)
5. Battery and Solar rack
6. Other Installation accessories.

For Solar Panel and Inverter Installation needs, contact FEMI on 08023662352, 08165304602

This Installation was done at Lamgbasa in Ajah and it comprises of the following:

1. 1.2Kw power inverter
2. One 12V 200ah Deep cycle battery (brand new)
3. Fuse Box
4. Change over switch
5. Cables and other installation accessories

All at a cost of N95K

Yes, very much active. Only that we lost 5months of valuable data.

Testing Xantrex inverters. Re-installation of these inverters was done for a nairalander at around Ago palace way in lagos

1000W, 1200W and 2000W inverters

Available

For more call FEMI on 08023662352, 08165304602

Details sent to marybng@yahoo.com

Details sent to emmydeep@gmail.com

For more call FEMI on 08023662352, 08165304602

For more call FEMI on 08023662352, 08165304602

For more call FEMI on 08023662352, 08165304602

For more call FEMI on 08023662352, 08165304602

Yes, its available, the 1000W also comes with cigarette lighter adapter which means it can be used in the car as well as in the house. Thanks so much for your interest.
For more call FEMI on 08023662352, 08165304602

ameh99: Hw much can I get fairly new 200amp deep cycle battery

Thanks for your enquiry, each one goes for N20, 000.

For more call FEMI on 08023662352, 08165304602

For more call FEMI on 08023662352, 08165304602

For more call FEMI on 08023662352, 08165304602