Best Inverter and Battery combination request

[SeanMG]

the previous battery count on 48v system was part of the problem imo

your capacity usable would have been 3840 wh
but almost impossible to extract , 6 batteries on a 48v system would have meant silly layout (hope it was a typo)

the most you would be able to extract would have been 2560wh before damaging batteries

and thus 3150wh would have meant damaging batteries from day one
ie based on your 450w x 7hrs

you can use lifep04 on lead acid devices
the voltages match perfectly, you have to make sure to buy a 16s/51.2v battery or change settings on the inverter if buying a 48v pack

if you can change the settings you would want to maybe up the charge rate limitations of lead acid isn't there anymore so can get them full as quick as possible

ie you want the batteries always full to have to longest backup available

if you start with a 5.12kwh battery you would have about 10hrs backup with that load
and can later add more batteries if you need longer
working on an efficiency of 90% thumbsuck

i would buy a 51.2v pack instead of using 4x12v batteries to remove initial /subsequent balancing complications

Edit : on your existing device

Hi Leon

After opening the cabinet, It only has 4 batteries and not the 6 i had originally thought.

The 51.2v battery seems to be an option, however with the inverter only having a fixed 10A charge option, I don't think mating the inverter to a 51.v battery is going to beneficial, especially if we hit stage 6 again in the future, with regards to charging the larger battery.

I'm thinking a new inverter with a new battery will be the way to go.
But it would need to be in a trolley type configuration similar to the 5kVa trolley set up on a previous post of mine.

I have ordered a Kill-a-watt devise from takealot so i can get an accurate Kw reading.

 

[leon.davibe]

Hi Leon

After opening the cabinet, It only has 4 batteries and not the 6 i had originally thought.

The 51.2v battery seems to be an option, however with the inverter only having a fixed 10A charge option, I don't think mating the inverter to a 51.v battery is going to beneficial, especially if we hit stage 6 again in the future, with regards to charging the larger battery.

I'm thinking a new inverter with a new battery will be the way to go.
But it would need to be in a trolley type configuration similar to the 5kVa trolley set up on a previous post of mine.

I have ordered a Kill-a-watt devise from takealot so i can get an accurate Kw reading.

i see a lot of guys recommend

@DuracellBunny so maybe he can give you a price for it

agreed the charge rate could become a problem
ie the charge rate is essentially just right for stage 6 ie it can put back what you take out

edit if they use something else it throws your calculations out of whack

if you have a bit bigger battery it can get it full on stage 6 as the 2 hrs stint gives a reprieve

but agree if you want to always have the maximum backup time
ie i charge my batteries as fast as possible so if we have an unscheduled outage i know i can cope with it again



then yes a new inverter that can charge at lets say 60A would mean

that in 40min it would be able to recharge the 1.8kwh you used in a 4hrs shedding and have the full capacity available again


and thus if you an extended outage
lets say you had unplanned outage and used all the stored energy from the 10kwh ie 2x 5kwh batteries

the next time you have power an inverter with a 50-60a charge rate would be able to charge both batteries full in 4hrs that you are on again

edit
if you just buy 1x 5kwh you would have about 10hrs standby time based on your 450w figure and be able to recharge it in 2hrs at max charge rate of 50a