Charge batteries while amps connected?

[Side Show 10+ year member]

has anyone run a charger with the car off whilst cranking the system? what issues would this cause?

 

[naughtyca 10+ year member]

has anyone run a charger with the car off whilst cranking the system? what issues would this cause?

i dont think the charger will keep up, you will still eventually lose voltage

 

[Side Show 10+ year member]

^^ sweet thanks

 

[mlstrass 5,000+ posts]

I use the $40 schumacher to charge my 18 batt bank with no issues. Just takes a while if batts are low, like 1-2 days...