Just Alternative Power build inverters and offer 1 year full warranty where repairs or outright replacements are effected if necessary.
As regards batteries if you have N30,000.00 to spend on a 12v 92Ah deep cycle battery then you can be sure to have a design life of 14 years.
We just installed 30 nos of these batteries last Saturday and this is the best deep cycle in the market today.
In the real sense the cost of your inverter is immaterial as you can get a good inverter at a cheap rate just as you can get a bad one after paying so much money.
What matters is the warranty and after sales support should the need arise.
www.justalternativepower.com