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The Wilderness

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Posted: 10/31/20 12:16pm Link  |  Quote  |  Print  |  Notify Moderator

Gel electrolyte batteries typically have a higher internal resistance than AGMs, so you would expect 'SiO2' batteries to have a higher internal resistance and higher voltage drop under load. Furthermore, the internal resistance rises as the SOC decreases (all batteries) and lead acid voltage decreases rapidly with decreasing SOC, leading to the shutdowns you are seeing.

LiFePO4 has a lower internal resistance to start with (although the BMS can add some resistance), higher starting voltage and very little decrease of voltage with decreasing SOC, making it better suited to high load situations.

BFL13

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Posted: 10/31/20 12:54pm Link  |  Quote  |  Print  |  Notify Moderator

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* This post was edited 10/31/20 05:58pm by BFL13 *


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Posted: 10/31/20 01:47pm Link  |  Quote  |  Print  |  Notify Moderator

I think we have had this discussion previously - a gel battery is a lead acid battery where the sulfuric acid electrolyte is absorbed into SiO2 powder. I am not sure how an 'SiO2' battery differs from this, besides marketing?

Gel/AGM/SiO2 are all valve regulated lead acid batteries (VRLA, ie sealed) so I guess you could claim they are all modified versions of each other.

A higher quality AGM like Odyssey/Northstar have internal resistance around 2-3 mOhms, cheaper ones like Renogy are around 4-5 mOhms. LiFePO4 (eg Lithionics) are at about 3 mOhms. In these cases you will have 30 - 60% lower voltage drop under load.

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Posted: 10/31/20 02:50pm Link  |  Quote  |  Print  |  Notify Moderator

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* This post was last edited 10/31/20 05:41pm by BFL13 *   View edit history

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