Originally Posted by
GCE
Hi
Further to Dave's calculation above
For option 1 a Gel battery 100AH will a small inverter would do the trick and only discharge to around 30% - Would be in the region of R8K depending on inverter, battery box and battery
For Option 2 a would say lithium as lead Acid would require to many batteries and a bigger inverter to handle the recharge current and time. At the required 9,6KWH needed and using 30% depth of Discharge , I estimate 26 batteries would be needed and they would need to be replaced every 5 years .
Gel batteries - 26 x R 2 500.00 + inverter estimate 10K + battery housing ? ) = +/-75K - The release of gases on charging and discharging the batteries would need to be taken into account.
Lithium - inverter 10K + 3 x 3,2KWH Lion batteries ( 51K ) = +/- 61K and could go to 150K depending on the quality and requirements from a software point.
A gel battery Depth of discharge ( DOD) to cycles normal sits around
15% DOD - about 2000 cycles
30% DOD - about 1500 cycles
50% DOD - about 1000 cycles
80% DOD - about 500 cycles
Once Gel has cycled to the 80% or lower mark , once or twice you will be replacing within 2 years - You do get decent small inverters that can cut power when the Gel gets to 50% -
The prices tossed in above are estimates and there are various qualities of material around - It is figures I normally throw out there when I get calls so that I can get to a budget that they are prepared to spend .
If I was doing that for myself I would through some PV panels ( 40K to 100K ) in and use the inverter and batteries to store and supply other , what I deem ,critical items and then manage if there was a prolonged outage .
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