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<blockquote data-quote="CarAudio.com - Hal" data-source="post: 8923257" data-attributes="member: 682097">To determine the right size and type of lithium battery for your setup, consider the following factors:1. Total Power Demand: Your setup has an 8000W RMS amplifier and a 300W RMS amplifier, which means:&nbsp;&nbsp; - Total RMS Power: 8000W + 300W = 8300W2. Current Calculation: &nbsp;&nbsp; - The current draw (in amps) can be calculated using the formula: &nbsp; &nbsp;&nbsp; \[&nbsp; &nbsp;&nbsp; \text{Current (A)} = \frac{\text{Power (W)}}{\text{Voltage (V)}}&nbsp; &nbsp;&nbsp; \]&nbsp;&nbsp; - Using a 12V system (which is typical for car audio):&nbsp; &nbsp;&nbsp; \[&nbsp; &nbsp;&nbsp; \text{Current} = \frac{8300W}{12V} \approx 691.67A&nbsp; &nbsp;&nbsp; \]3. Battery Size: &nbsp;&nbsp; - Lithium batteries are rated in amp-hours (Ah). To maintain performance without significant voltage drop, you&#039;ll need a battery that can handle the high draw.&nbsp;&nbsp; - A common recommendation is to have at least 1.5 to 2 times the total current draw in Ah.&nbsp;&nbsp; - For example, if you use a 691.67A draw, a battery bank of about 1050Ah to 1380Ah would be beneficial.4. Alternator Consideration: &nbsp;&nbsp; - Since you have a 400A alternator, you&#039;ll be limited to how much can be replenished while the car is running. It would be best to have a larger battery bank to run your system when the vehicle is off or during peak power demands.5. Suggested Battery: &nbsp;&nbsp; - Look for lithium batteries with a high discharge rating (C-rate) to ensure they can handle the current without voltage drop. Brands like Battle Born, Renogy, or Kinetik offer options that may fit your needs.### Recommendations:<ul>
<li data-xf-list-type="ul">Aim for a lithium battery setup of around 1000Ah to 1500Ah, considering your power demands and alternator output.</li>
<li data-xf-list-type="ul">Ensure proper wiring and connections to handle high currents, and consider multiple smaller batteries in parallel if necessary.</li>
</ul>Always ensure proper installation and safety measures are taken to prevent any electrical issues.</blockquote>

[QUOTE="CarAudio.com - Hal, post: 8923257, member: 682097"] To determine the right size and type of lithium battery for your setup, consider the following factors: 1. [B]Total Power Demand[/B]: Your setup has an 8000W RMS amplifier and a 300W RMS amplifier, which means: - [B]Total RMS Power[/B]: 8000W + 300W = 8300W 2. [B]Current Calculation[/B]: - The current draw (in amps) can be calculated using the formula: \[ \text{Current (A)} = \frac{\text{Power (W)}}{\text{Voltage (V)}} \] - Using a 12V system (which is typical for car audio): \[ \text{Current} = \frac{8300W}{12V} \approx 691.67A \] 3. [B]Battery Size[/B]: - Lithium batteries are rated in amp-hours (Ah). To maintain performance without significant voltage drop, you'll need a battery that can handle the high draw. - A common recommendation is to have at least 1.5 to 2 times the total current draw in Ah. - For example, if you use a 691.67A draw, a battery bank of about 1050Ah to 1380Ah would be beneficial. 4. [B]Alternator Consideration[/B]: - Since you have a 400A alternator, you'll be limited to how much can be replenished while the car is running. It would be best to have a larger battery bank to run your system when the vehicle is off or during peak power demands. 5. [B]Suggested Battery[/B]: - Look for lithium batteries with a high discharge rating (C-rate) to ensure they can handle the current without voltage drop. Brands like Battle Born, Renogy, or Kinetik offer options that may fit your needs. ### Recommendations: [LIST] [*]Aim for a lithium battery setup of around [B]1000Ah[/B] to [B]1500Ah[/B], considering your power demands and alternator output. [*]Ensure proper wiring and connections to handle high currents, and consider multiple smaller batteries in parallel if necessary. [/LIST] Always ensure proper installation and safety measures are taken to prevent any electrical issues. [/QUOTE]

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