April 13, 20224 yr 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!
April 13, 20224 yr 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, 20224 yr by Nexuss
April 13, 20224 yr 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.
April 15, 20224 yr 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, 20224 yr by system32
April 17, 20224 yr Author 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!
April 17, 20224 yr 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.
April 19, 20224 yr Author 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......!
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