PicHopper Posted April 13, 2022 Posted April 13, 2022 I am trying to work out which is the best option to go for: I am designing a solar PV system to manage the home. So far I have decided to go for a 8kW Sunsynk inverter with 8 x Panels. This will tie into what I believe is necessary - around 10kWh battery capacity. I need to get an idea of what would be the better solution: 1 x 10/8 Freedomwon battery 2 x 5.5kWh Hubble Batteries Please would you let me know which option is a better bet...... and why! Thanks for your very generous help! Quote
Nexuss Posted April 13, 2022 Posted April 13, 2022 (edited) I would go for the Freedomwon battery if those were the choices . They make very good batteries with LiFePO4 chemistry,the Hubble uses Nickel Manganese Cobalt (NMC) chemistry which is gradually being phased out due to rare metal shortages/cost/safety. The hubble batteries also regularly run into issues where they can not communicate with the inverter via BMS without the SOH dropping drastically in a short timeframe so you have to end up using AGM/voltages vs the preffered BMS comms. There is a whole thread on here with people struggling with the Hubble batteries so be warned. Edited April 13, 2022 by Nexuss system32 1 Quote
Czauto Posted April 13, 2022 Posted April 13, 2022 Also look at Freedom Won's eTowers. 5.1Kwh stackable and much cheaper than their Lite range. I've bought 2 in December 2021 and I'm very happy them. They integrate seamlessly with Victron equipment. system32 1 Quote
system32 Posted April 15, 2022 Posted April 15, 2022 (edited) On 2022/04/13 at 12:24 PM, PicHopper said: I am trying to work out which is the best option to go for: I am designing a solar PV system to manage the home. So far I have decided to go for a 8kW Sunsynk inverter with 8 x Panels. This will tie into what I believe is necessary - around 10kWh battery capacity. I need to get an idea of what would be the better solution: 1 x 10/8 Freedomwon battery 2 x 5.5kWh Hubble Batteries Please would you let me know which option is a better bet...... and why! Thanks for your very generous help! Note that Hubble AM-2 110Ah/5.5kWh is the "marketing" capacity. Some of the specifications for Hubble AM-2 indicate only 100Ah "to protect the battery from Dendrite formation". See https://www.hubblelithium.co.za/uploads/1/3/5/0/135079623/hubble_lithium_am-2_a4_pamphlet.pdf You spending a lot on batteries, so: Ask both suppliers for the actual daily usable capacity in kWh - not the marketing capacity. Confirm the warranty period of the battery used for daily cycle. Ask the supplier for the kWh rating as it's a more reliable measurement than Ah. kWh is also easier to compare with the utility meter - which also works in kWh. Ah * V = kWh - but battery has a range of 42V to 53.6V - so which V is the manufacturer using? The other important number is the "C rating" of the battery which determines the max Charge/Discharge Amps * 48V. Both batteries seem to have good "C ratings". Edited April 17, 2022 by system32 Quote
PicHopper Posted April 17, 2022 Author Posted April 17, 2022 On 2022/04/15 at 11:06 AM, system32 said: Note that Hubble AM-2 110Ah/5.5kWh is the "marketing" capacity. Some of the specifications for Hubble AM-2 indicate only 100Ah "to protect the battery from Dendrite formation". See https://www.hubblelithium.co.za/products.html You spending a lot on batteries, so: Ask both suppliers for the actual daily usable capacity in kWh - not the marketing capacity. Confirm the warranty period of the battery used for daily cycle. Ask the supplier for the kWh rating as it's a more reliable measurement than Ah. kWh is also easier to compare with the utility meter - which also works in kWh. Ah * V = kWh - but my battery has a range of 42V to 53.6V - so which V is the supplier using using? The other important number is the "C rating" of the battery which determines the max Charge/Discharge Amps. Both batteries seem to have good "C ratings". Thank you for the heads up! Much appreciated! Quote
Scorp007 Posted April 17, 2022 Posted April 17, 2022 On 2022/04/13 at 12:24 PM, PicHopper said: I am trying to work out which is the best option to go for: I am designing a solar PV system to manage the home. So far I have decided to go for a 8kW Sunsynk inverter with 8 x Panels. This will tie into what I believe is necessary - around 10kWh battery capacity. I need to get an idea of what would be the better solution: 1 x 10/8 Freedomwon battery 2 x 5.5kWh Hubble Batteries Please would you let me know which option is a better bet...... and why! Thanks for your very generous help! My only input is if you have 2 batteries and 1 needs to be sent in for repairs you can stiil use the system at reduced capacity. Quote
PicHopper Posted April 19, 2022 Author Posted April 19, 2022 On 2022/04/17 at 2:54 PM, Scorp007 said: My only input is if you have 2 batteries and 1 needs to be sent in for repairs you can stiil use the system at reduced capacity. Thanks for the tip - that makes sense......! Quote
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