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Pylontech B or C


isetech
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7 minutes ago, isetech said:

There is a US3000B and a US3000C battery 

I am trying to figue out differnce ... other than the price and DOD (B - R 18490.00 ...  80 % DOD  ...  and the C - R 18450.00 ... 95% DOD) and why the C which has a better DOD is R40 cheaper?

C is the newest version that came out a few months ago. 

Price difference is negligible. B version is older stock and most places I've looked at is out of stock of the B version and will also not be getting any stock as its discontinued. 

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Application : 5 KVA RCT inverter

RCT : 5KVA

Voltage : 48 VDC

Rated : 98 amps DC 

@ 4000 watts current required from the battery = 98 amps DC ( 200 amp hours recommended ... but assuming this is the recommendation for a lead acid battery or other batteires like the pylontech with a C 0.5 rating) 

@ 5000 watts on the output = 5000 / 230 = 21.74 amps (AC side)

 

If you have a 3500 wh (72 amp/hr capacity) battery which can only sustain a max value of 1800 wh (37 amp/hr) 

If the battery could produce 3500 wh / 48 VDC = 72.92 amps.

If the battery can only produce 1800 wh / 48 VDC = 37.5 amps 

 

Considering installing a 3,5 kwh pylontech which is within the budget however reading through the spec sheet ... I came across this note ... I have read on this forum about pylontech being rated at 0.5 ... but still trying understand the logic.

  • Deliver up to 3.5kW* with single module (3.5kWh) - * please note this value is inverter/charger dependent, typically the maximum sustained value is 1.8kW per battery

As I attempt to make sense of it all ... it just doesnt make sense to use a 3.5 kwh  pylontech battery with a 5 kva unit ... if you look at the inverter spec ... you would require at least 2 in parallel and to be within the recommended spec ... 3 would be more suitable ... looking at the price comparison to C1 rated batteries. 

If doing a price comparison a 3.5 kwh ... you would need to compare a pylontech to a 1.8 kwh C1 rated battery.

Disclaimer ... Still wandering through the maize with that blank look ... its still gonna take a while to understand the whole big picture. 

 

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I was gonna go with a US2000C for the Temp. 1 inverter stand alone system until the 3 in parallel are ready to connect ... however as I learn more about batteries (what happened to the old days of just buying a 105 amp/hr Deltec deep cycle battery and be done) I realised it wasnt an option for a 5 KVA unit not even just for a few small essential loads ... I was ready to order the US3000C this morning to use the temp. and then buy an addtional battery and use it for another site ... which I might still do ... however after reading the spec sheet I decided to do a little more research ... create an XL spreadsheet and do a comparison of useable KWH (C rating)  to rand value ... rather than just looking looking at price.

I need to make sure the battery capacity is enough to run the full load of 3 x 5 KVA units ... 66 amps .... 230 VAC ... which will require at least 280 amps. 

This is something I need to do more research on ... Its one thing using a lithium battery if you have more than enough capacity ... 280 amp/hr (14kwh 4 x 3.5 kwh pylon batteries ... even then they only have 50 % of the capacity ) ... but lets say I install 2 x US3000C = 7 kwh .. .thats only 145 amp/hr ... then we back to trying to isolate appliances around the house to prevent overloading the batteires ... or seperating circuit and rerouting and rewiring ... cost to do all that ... it might be cheaper just to pay a little extra and get a C1 rated battery.

 

 

 

 

 

 

 

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