RV Electrical, Solar & Battery Bank Tooling

What is the consequence of undersized copper wire on a high-draw 12V DC appliance (e.g. 12V compressor fridge)?

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 Correct IncorrectExcessive voltage drop across the wire length causes the voltage at the appliance to sag below its low-voltage cutoff threshold (e.g. 10.5V), causing error lockouts even with a full battery.

What is the consequence of undersized copper wire on a high-draw 12V DC appliance (e.g. 12V compressor fridge)?

• The wire will turn magnetic
• Excessive resistance voltage drop trips the appliance's low-voltage safety cutoff, causing premature shutdown
• The appliance runs twice as fast
• The battery will recharge itself