I went to drop my daughter at school this morning. After inserting the key and turning I got nothing. No lights, beeps or the usualy (Ready) display.
I was kind of expecting this to happen some day. The Imiev uses a conventional 33AH 12v flooded lead acid
battery as its accessory battery.
This small lead acid battery has a very easy life. It's main job it is to boot up the main traction pack contractors and engage the main traction pack when you turn the key. From that moment on the DC/DC converter powered from the traction pack takes over all 12v loads.
The lead acid battery is also used to power your radio, warning lights and stationary 12v loads when the ignition key is in accessory position but you havent started
the car (engaged the traction pack and dc/dc converter)
The 12v battery is charged by the DC/DC converter when driving or whenever the ignition is in the (ready position) the battery is also charged when the main traction pack is being charged from AC power.
So I had about 3.8v in the lead acid battery. I started to think if I had a interior light on last Friday (last time the car was used) I applied 12v to the battery from another small 12v battery and the passenger side interior light came on
I was 99% sure the imiev automatically turned off the interior light after 1hr or so....perhaps not. So looks like the light was on for a good few days and this 4 1/2 year old 33ah battery didn't like that.
Not enough energy in it to boot the cars traction pack .
I thought it was time to show the car some love and replaced the little 12v lead acid battery with a new one given its age. Though the old one looks to be recovering ok and has been sucking up the amps for several hrs on charge.
I did have a thought about using 4x40ah calb cells i have (as they are almost identical dimensions) Though probably a wast of nice lithium cells doing a very easy job. Weight saving would be lucky to be 4kg.
Why they used a lead acid battery in a lithium powered car. I think it was for times like this when you do kill the battery or it just wears out . You can pop down to the auto parts store (or just about anywhere in the country) and get a replacement and be on your way again. Many people would have a conventional lead acid battery charger in there garage so they could use that. I think because the ignition battery is something the end user might get involved with they kept it simple and idiot proof.
Offgrid 2008, Selectronic PS1 6kw/48v inverter, x 2 Midnite solar classic 150 MPPT, 3960w NE PV 24 x 165w BP panels, 4200w NW PV 21 x 200w DAQO PV, 16x400ah lithium.