Inverter & Power consumption

@technofast do update if you change the inverter I have a local inverter installed in my garage and it needs a replacement now.

What brand is recommended nowadays? if inverter load would be about 800-900 w
Mods may remove this question if this hijacks the thread I may create a different thread.
You might have already bought, but for others:
Exide (gqp 1450, better to reduce load to 600-700W and go for gqp 1125) seams to have better BMS, 15W stand-by 30W when trickle charging fully charged battery, their battery to main efficiency as per various youtube videos is around 87%, which is very good compared to Luminous, Microtek etc, battery by any good brand Luminous, Exide, Amron etc
@technofast do update if you change the inverter I have a local inverter installed in my garage and it needs a replacement now.

What brand is recommended nowadays? if inverter load would be about 800-900 w
Mods may remove this question if this hijacks the thread I may create a different thread.
You might have already bought, but for others:
Exide (gqp 1450, better to reduce load to 600-700W and go for gqp 1125) seams to have better BMS, 15W stand-by 30W when trickle charging fully charged battery, their battery to main efficiency as per various youtube videos is around 87%, which is very good compared to Luminous, Microtek etc, battery by any good brand Luminous, Exide, Amron etc
 
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Let me explain my point of view.
1. When Electricity is on: In this state, battery will charge at around 200w (14.4v*15A). Plus, whatever load is connected to inverter will be fed directly from mains power (inverter connects mains to load directly).
2. When electricity is gone: inverter will turn on (with relay) and feed power from battery. Here, there is conversion loss.

Lead acid Battery charging has three stages: bulk, absorption and float. At float, battery charges at around 20w. So, if your battery is bad, then this stage will never reach and battery will always charge at 100-200w. If one cell is dead, then battery will boil and get warm.

So, there is loss in charging and discharging from transformer. Copper based transformer has lower loss compared to aluminium. But for your case this won't consume many units.

With the above knowledge, check how many units it consume to charge without connecting the load and see if the power settles down to float.
 
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